# Counties in Montana by median age, 2024

All 56 values come from U.S. Census Bureau for 2024, so the places are comparable.

- Indicator id: `median_age`
- Unit: years
- Definition: Age that divides the resident population into two halves of equal size. Spain and the EU: on 1 January. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.
- Source: U.S. Census Bureau, American Community Survey 5-year estimates, table B01002: median age, total population (https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b01002.dat)
- Retrieved: 2026-10-08
- Citation: U.S. Census Bureau. American Community Survey 5-year estimates, table B01002: median age, total population. https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b01002.dat. Retrieved 2026-10-08.
- Web page: https://invokely.ai/rankings/median-age/montana-counties
- CSV: https://invokely.ai/download/rankings/median-age/montana-counties.csv

| Rank | Place | years |
|---:|---|---:|
| 1 | Meagher County | 58.3 |
| 2 | Prairie County | 57.8 |
| 3 | Carter County | 56.9 |
| 4 | Sanders County | 54.6 |
| 5 | Daniels County | 53.4 |
| 6 | McCone County | 53.2 |
| 7 | Granite County | 53 |
| 8 | Lincoln County | 52.8 |
| 9 | Madison County | 52.2 |
| 10 | Treasure County | 52 |
| 11 | Petroleum County | 51.6 |
| 12 | Musselshell County | 51.3 |
| 13 | Golden Valley County | 50.9 |
| 14 | Carbon County | 50.4 |
| 15 | Mineral County | 50 |
| 16 | Deer Lodge County | 49.9 |
| 17 | Ravalli County | 48.7 |
| 18 | Powder River County | 47.3 |
| 19 | Jefferson County | 47.1 |
| 20 | Sweet Grass County | 47 |
| 21 | Stillwater County | 46.7 |
| 22 | Judith Basin County | 46.2 |
| 22 | Wheatland County | 46.2 |
| 24 | Park County | 46 |
| 25 | Broadwater County | 45.9 |
| 26 | Powell County | 45.8 |
| 27 | Phillips County | 45.6 |
| 28 | Fergus County | 44.4 |
| 29 | Lake County | 44.3 |
| 29 | Valley County | 44.3 |
| 31 | Garfield County | 43.3 |
| 32 | Beaverhead County | 43.2 |
| 33 | Sheridan County | 43.1 |
| 34 | Chouteau County | 43 |
| 34 | Dawson County | 43 |
| 36 | Custer County | 42.7 |
| 37 | Teton County | 42.3 |
| 38 | Flathead County | 42.2 |
| 39 | Pondera County | 42 |
| 40 | Lewis and Clark County | 41.8 |
| 41 | Wibaux County | 41 |
| 42 | Silver Bow County | 40.5 |
| 43 | Liberty County | 39.8 |
| 44 | Yellowstone County | 39 |
| 45 | Cascade County | 38.6 |
| 46 | Richland County | 38.4 |
| 47 | Rosebud County | 38 |
| 48 | Toole County | 37.7 |
| 49 | Fallon County | 37.5 |
| 50 | Missoula County | 37.1 |
| 51 | Blaine County | 35.6 |
| 52 | Hill County | 34.5 |
| 53 | Gallatin County | 34.2 |
| 54 | Glacier County | 33.4 |
| 55 | Big Horn County | 31.9 |
| 56 | Roosevelt County | 30.9 |